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| June 25 |
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| DOUGLAS HYDE INAUGURATED THE FIRST PRESIDENT OF IRELAND. Hyde was one of the leaders of the Gaelic cultural revival and a Protestant. His election was taken as a persuasive gesture toward Northern Ireland. | 1 |
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| 1939, Jan 16 |
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| After issuing an ultimatum on the removal of all British troops from Irish soil, the IRA began its first series of bomb attacks in England (ended May 1940). | 2 |
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| July 4 |
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| The Matrimonial Causes Act in Northern Ireland gave the supreme court the power to grant divorce for adultery, desertion, cruelty, or incurable unsoundness of mind. | 3 |
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| Sept. 2 |
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| De Valera announced Ireland's intention of remaining neutral. | 4 |
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